BODY 8E3095 - Caterpillar

Illustration 2 g03368682
Sensor connector
(Terminal A) Sensor supply
(Terminal B) Sensor return
(Terminal C) Signal
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -3 code is active or logged.
Proceed to Test Step 2.
Result: A -4 code is active or logged.
Proceed to Test Step 3.
2. Create a Short at the Sensor Connector
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the sensor with the active -3 code.
C. Install the jumper wire between the following terminals at the sensor connector:
- Terminal B (sensor return) and Terminal C (sensor signal)
D. Connect Cat ET.
E. Use Cat ET to monitor the following:
- -4 code
F. Turn the main disconnect switch to the OFF position.
Create a Short
Result: A -4 code did not become active.
Proceed to Test Step 4.
Result: A -4 code becomes active.
Repair: The wiring harness is OK. Replace the sensor.
If the problem is not resolved, proceed to Test Step 4.
3. Create an Open at the Sensor Connector
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the sensor with the active -4 code.
C. Connect Cat ET.
D. Use Cat ET to monitor the following:
- -3 code
E. Turn the main disconnect switch to the OFF position.
Create an Open
Result: A -3 code did not become active.
Proceed to Test Step 4.
Result: A -3 code becomes active.
Repair: The wiring harness is OK. Replace the sensor.
If the problem is not resolved, proceed to Test Step 4.
4. Check the 8 VDC Supply Voltage at the Sensor Connector
A. Turn the main disconnect switch to the ON position.
B. Measure the voltage at the following terminal locations of the affected sensor connector:
- Terminal A (sensor supply) and Terminal B (sensor return)
C. Reconnect the sensor.
Supply Voltage
Result: The supply voltage is approximately 8.0 0.2 VDC
Proceed to Test Step 8.
Result: The supply voltage is not approximately 8.0 0.2 VDC.
Repair: There is a short in the wiring harness to the battery. Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 5.
5. Check the Detonation Circuit for an Open
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the sensor with the active code.
C. Disconnect the J2 connector at the ISM.
D. Measure the resistance between the following locations for the sensor:
- Terminal C (sensor connector) and the appropriate detonation signal wire on the ISM connector
Open Circuit
Result: Less than 10 ohms of resistance between the sensor connector and the ISM connector.
Proceed to Test Step 6.
Result: More than 10 ohms of resistance between the sensor connector and the ISM connector.
Repair: There is an open circuit in the wiring harness. Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 6.
6. Check the Detonation Circuit for a Short Circuit
A. Turn the main disconnect switch to the OFF position
B. Disconnect the sensor with the active code.
C. Disconnect the J2 connector at the ECM.
D. Measure the resistance between the following locations for the sensor:
- Terminal C (sensor connector) and Engine ground
Short Circuit
Result: